Tamerlan Tsarnaev has been named as a participant in a 2011 triple homicide in Waltham. Credit: FBI

A report by U.S. officials said that Russian authorities failed to provide American investigators with all of the details it had about one of the accused Boston Marathon bombers.

The inspector general's report said that the Russian government declined to provide the FBI with information about Tamerlan Tsarnaev that likely would have led to more scrutiny of him years before the April 15 attack, according to the New York Times.

The report claims that Russian officials denied several requests by the FBI for additional information on Tsarnaev following an initial investigation in 2011.

Only after the bombings did Russian officials share the additional information, including an intercepted phone conversation between Tsarnaev and his mother in which the two talk about Islamic jihad, the report said, according to the Times.

Tsarnaev and his younger brother, Dzhokhar, are accused of setting off the bombs near the Boston Marathon finish line last year that killed three people and injured more than 260 more. Tsarnaev was killed during a shootout with police in Watertown on April 19. His brother was eventually caught and is awaiting trial. They are also accused of fatally shooting MIT police officer Sean Collier.